JPS62293036A - Ventilation air conditioner in atomic power plant - Google Patents

Abstract

PURPOSE:To prevent snow from adhering onto the surface of a filter so as to maintain the soundness of a ventilation air conditioning system by disposing a snow trapping device against which external air which is taken therein as an upward flow through a louver run between external air intake port and a filter. CONSTITUTION:A snow trapping device 21 is installed at the tip surface part of a space 20 between an external air intake port 1a and a bag type filter 4, at an inclination angle where external air taken therein as an upward flow through a louver 2 run against the device 21 substantially rectangularly. The snow trapping device 21 comprises a core material 21a made of an eliminator or a vertical type louver and nets 21a of approximately 6-24 meshes disposed on both surfaces thereof. When external air run against the snow trapping device 21, snow in the external air adheres to the core material 21a and the nets 21b and is removed and only external air is sent to the side of the bag filter 4. For this reason, adherence of snow to the bag filter 4 is prevented.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Purpose of the invention] (Industrial application field) The present invention relates to a lagoon inside a building in a nuclear power plant.

Humidity 1. The present invention relates to a ventilation air conditioning system for controlling and maintaining cleanliness, and in particular to a ventilation air conditioning system for a nuclear power plant that can prevent snow from entering the outside air intake port and snow from entering the filter surface.

(Prior art) Ventilation air SL in a nuclear power plant! l Equipment must maintain the environment necessary for the normal operation of each plant equipment, and provide appropriate environmental conditions (indoor temperature, humidity, cleanliness, ventilation flow, etc.) to operating ports and work areas. -0 Figures 5 to 7 show this type of conventional ventilation air conditioning system, in which a louver 2 is attached to an outside air intake 1a provided in a building 1, and a supply air processing device 3 This allows outside air to enter the building and prevents rainwater from entering the building.

Inside the supply air processing device 3, there are installed a bug-type filter 4 for removing foreign substances such as dust and particulate salt from the outside air, and a heating coil 5 and a cold section coil 6 for cooling the outside air. The outside air after being processed by this air supply processing device 3 passes through an air supply duct 7 having a damper 7a,
50% Yong Ng 3 units (one of which is a spare) or 100%00
A blower 8 (21 units with a capacity of 21 units in reserve) is used to blow air into each air-conditioned space 9, which is a space with a high radiation level (so-called contaminated area) or a space where radioactive materials are not present (so-called clean area).

By the way, in the case of air conditioning for contaminated areas, the purpose is to prevent radioactive materials from staying in the air conditioned space 9, and therefore, as shown in FIG. A one-through system is adopted in which the same air as the -4 mother air is discharged outdoors from an exhaust pipe 13 by an exhaust fan 12 through an exhaust duct 11 equipped with an exhaust treatment device 10 having a bag-type filter 10a. The exhaust treatment device 10 and the exhaust fan 12, like the blower 8, have the safety, reliability, and redundancy of the plant, so the 50%
It has a configuration of 3 units with a capacity of 1 (of which 1 is reserve 1a) or 21 units with 100% 00% capacity are spares.

On the other hand, in the case of air conditioning for clean areas, the accumulation of radioactive materials is not a problem, so a part of the air that has been heat exchanged in the air conditioned space 9 is returned to the supply air processing device 3, and the remaining air is A return duct method for exhaust air is being explored.

(Problems to be Solved by the Invention) In the conventional ventilation air conditioning system for a nuclear power plant having the above configuration, when a nuclear power plant is constructed in an area with a lot of snow, especially in the case of powder snow with a low moisture content, Snow passes through the louver 2 and enters the air supply processing device 3 along with the outside air and adheres to the bug-type filter 4. If there is a lot of snow, the bug-type filter 4 will become clogged in a very short period of time and the ventilation will be interrupted. There is a possibility that the health of the air conditioning system cannot be maintained.

The present invention has been developed with these points in mind, and even if snow enters with outside air, it can prevent snow from adhering to the filter surface and maintain the integrity of the ventilation air conditioning system. The purpose is to provide a ventilation air conditioning system that can be used in a nuclear power plant.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an air conditioning system that uses outside air taken in as an upward flow through a louver installed at an outside air intake port to pass through a filter to remove foreign matter in the outside air. This is a ventilation air conditioning system for a nuclear power plant that supplies air to a space, and is characterized in that a snow trap device is disposed between an outside air intake port and a filter, with which an upward flow taken in through a louver collides with the snow trap device.

(Function) In the ventilation air conditioner for a nuclear power plant according to the present invention, a snow trap stomach is disposed between the outside air intake and the filter, so that the upward flow taken in through the louver collides with the snow trap. Even if snow were to enter the filter together with outside air, when the snow collides with the outside air and the snow trap device, the snow is removed by the snow trap device and only outside air is supplied to the filter. Therefore, it is possible to prevent snow from adhering to the filter surface.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The present invention is characterized only by the structure of the outside air intake port, and the other parts are completely the same as the conventional structure, so only this characteristic part will be illustrated and explained below.

In FIG. 1, reference numeral 1 denotes a building, and 2 denotes a louver attached to an outside air intake port 1a provided in this building 1. On the outlet side of this louver 2, a bug-type filter 4 of the supply air processing equipment 1 and 3 is installed. is installed. The outside air then flows upward through the louver 2 to the supply air processing device 3 as shown by the arrow in FIG.
While passing through the bag-type filter 4, foreign substances such as dust and particulate salt are removed, and:
[After the temperature is controlled by a means (not shown), the air is supplied to each air-conditioned space (not shown) in the contaminated area or the clean area.

Space 2 between outside air intake port 1a and bag type filter 4
As shown in FIG. 1, a snow trap neck 21 is installed on the top surface of the snow trap 21 at an inclination angle such that the outside air, which is taken in as an upward flow through the louver 2, collides with the snow trap at a substantially right angle.

As shown in FIG. 2, this snow trap device fffi21 consists of a core material 21a consisting of an eliminator or vertical louver that is normally used for removing water droplets, and a core material 21a consisting of an eliminator or a vertical louver, and approximately 6 to 24 meshes arranged on the front and rear surfaces of the core material 4121a, respectively. When the outside air collides with the snow trap device 21, the snow in the outside air is attached to and removed from the core material 21a and the net 21b, and only the outside air is transferred to the snow trap device 2.
1 and is sent to the bug type filter 4 side. Snow adhering to the core material 21a and the ti 1421b is designed to fall and be removed by its own weight when its W exceeds a certain level.

As shown in FIG. 1, a pre-filter 22 is installed on the outlet side d1 of the snow trap device 2ff21, that is, on the −L flow side of the bag-type filter 4. As shown in FIGS. 3 and 4, this pre-filter 22 has a vertically long perforated plate 23 formed by drilling a large number of small holes 23a in an Rf-shaped steel plate whose cross section is approximately trapezoidal. The wind speed of the outside air that has passed through this pre-filter 22 is reduced to approximately 1.5 m/s, and even if the outside air contains snow, the snow will not be absorbed by the vehicle. It is designed so that it does not fall and reach the bug type filter 4.

Next, the operation of this embodiment will be explained.

When the ventilation air conditioner is activated during snowfall, the outside air flows through the louver 2.
The snow is guided into the supply air processing device 3 through the air, and after being treated there, it is sent to each air conditioned space (not shown), but at this time, snow also enters the supply air processing device 3 along with the outside air. I will do it.

This outside air and snow will be guided into the space 20 as an upward flow through the louver 2 as shown by the arrow in FIG. 1, and within the space 20, a snow trap device 21 is installed. Therefore, the outside air and snow are removed by this snow trap device 21.
After colliding with and passing through this, it is sent to the pre-filter 22. When the snow trap device 21 collides with the snow trap device 21, snow in the outside air adheres to the core material 21a and the net 21b and is removed.

When the snow adhering to the core material 21a and the net 21b exceeds a certain level, it falls due to its own weight, and the snow trap device 21
removed from

On the other hand, the wind speed of the outside air that has passed through the snow trap device 21 decreases to about 1.5 m/s while passing through the pre-filter 22, and even if the outside air contains snow,
Snow falls under its own weight and is removed from the outside air. This outside air is then interrogated by the bug type filter 4.

In this way, even if snow enters with the outside air,
Most of the snow is removed from the outside air while the outside air collides with and passes through the snow trap device 21, and even if some snow remains in the outside air, while the outside air passes through the prefilter 22 completely removed. This prevents snow from adhering to the bug type filter 4.

〔Effect of the invention〕

As explained above, in the present invention, a snow trap device is disposed between the outside air intake port and the filter, so that the outside air taken in as an upward flow through the louver comes into contact with the snow trap device, so that if snow enters with the outside air, Even if the air conditioner is damaged, it is possible to prevent snow from adhering to the filter surface and maintain the health of the ventilation air conditioning system.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts showing one embodiment of the present invention, Fig. 2 is a detailed view of the snow trap device, Fig. 3 is a detailed view of the pre-filter, Fig. 4 is the bottom surface of Fig. 3, FIG. 5 is a schematic system diagram showing a conventional ventilation air conditioner, FIG. 6 is an external perspective view showing an example installed in a building, and FIG. 7 is a side sectional view of the conventional ventilation air conditioner. DESCRIPTION OF SYMBOLS 1... Building, 1a... Outside air intake, 2... Louver, 3... Supply air processing device, 4... Bug type filter, 21... Snow trap device, 21a... Core Material, 21
b... Net, 22... Pre-filter, 23... Perforated folded plate, 23a... Small holes. Applicant's representative Sa Kou - 41 male eyes Figure 3

Claims (1)

[Claims] 1. In a nuclear power plant where outside air is taken in as an upward flow through a louver attached to an outside air intake, it is guided to a filter to remove foreign matter in the outside air, and then the air is sent to an air-conditioned space. 1. A ventilation air conditioning system for a nuclear power plant, characterized in that a snow trap device is disposed between the outside air intake port and the filter, with which an upward flow brought in through a louver collides. 2. The snow trap device consists of a core material formed by an eliminator or a vertical louver, and 16 parts arranged on both sides of this core material.
The ventilation air conditioner for a nuclear power plant according to claim 1, characterized in that the ventilation air conditioner has a mesh of approximately 24 to 24 meshes. 3. The ventilation air conditioner for a nuclear power plant according to claim 1 or 2, wherein the filter has a pre-filter on its upstream side. 4. The ventilation air conditioner for a nuclear power plant according to claim 3, wherein the pre-filter is formed of a perforated folded plate having a large number of small holes.